The performance-partsgasm that is Las Vegas' SEMA Show may be down on fuel this year because of the state of the economy, but that isn't stopping the Chrysler Group from unveiling four concepts based on the models in its lineup that are arguably the most endearing to the aftermarket. To that end, the company's Mopar devision has lavished a bunch of custom bits on everything from a pair of Jeep Wranglers (one of which is fit to sleep in, and the other looking fit enough to climb a wall) to a streetable 556-horsepower Dodge Challenger, and a dolled up Dodge Ram 1500.

Perhaps our favorite vehicle of the lot is the Wrangler "Lower Forty" - an imposing rig that uses a 5.7-liter Hemi V8 engine to churn its massive 40-inch tires. If it looks familiar, that's because it was first shown at the Moab Safari in April. Interestingly, the huge running gear upgrade has been applied to a standard ride-height two-door Rubicon - no suspension or body lift has been fitted. What has been screwed on, however, are new fender flares that ride four inches higher than stock, and they're an inch wider, too. Other trick bits include a new integrated roll cage, a relocated spare tire, a new drop-down tailgate with an old-school stamped Jeep logo. Did we mention the slick three-inch chop and the extra ten degrees of rake applied to the windshield?

Follow the jump for more details on the three remaining Chrysler SEMA show vehicles.